Considering the Number of Lines

To reforge something, a Reforging Tool is required. If you are not satisfied with a reforge, you are required to use a Fine, Credne's, or Commerce Reforging Tool, depending on what is needed.

Items that come reforged with a blank Rank 3 (from Spirit Weapon Reforging Glitch wayyyy back when the Reforging Tool was first released), 2, or 1, a Fine, Credne's, or Commerce Reforging Tool is required, since it was already pre-reforged (preforged?).

Fine and Credne's Reforging Tools can "rank up" the reforge to a higher level through a cutscene. If the rank is already 1, it may "critical" reforge with the same cutscene, giving much higher and stronger reforges. Credne's Reforging tools can also add more lines (Up to 3), up to 2 more if there is 1 line, or 1 more if 2 lines exists. Credne's randomly add lines, while still functioning as a Fine Reforge. Just use Credne's reforging tools if you need more lines, or use fine tools if you already reached the 3 line limit.